diff -r 000000000000 -r 959103a6100f src/share/classes/com/sun/tools/sjavac/comp/PubapiVisitor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/tools/sjavac/comp/PubapiVisitor.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.tools.sjavac.comp;
+
+import java.util.Iterator;
+import java.util.List;
+import javax.lang.model.element.Modifier;
+import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.element.TypeElement;
+import javax.lang.model.element.VariableElement;
+import javax.lang.model.type.TypeMirror;
+import javax.lang.model.util.ElementScanner6;
+
+/** Utility class that constructs a textual representation
+ * of the public api of a class.
+ *
+ * <p><b>This is NOT part of any supported API.
+ * If you write code that depends on this, you do so at your own
+ * risk.  This code and its internal interfaces are subject to change
+ * or deletion without notice.</b></p>
+ */
+public class PubapiVisitor extends ElementScanner6<Void, Void> {
+
+    StringBuffer sb;
+    // Important that it is 1! Part of protocol over wire, silly yes.
+    // Fix please.
+    int indent = 1;
+
+    public PubapiVisitor(StringBuffer sb) {
+        this.sb = sb;
+    }
+
+    String depth(int l) {
+        return "                                              ".substring(0, l);
+    }
+
+    @Override
+    public Void visitType(TypeElement e, Void p) {
+        if (e.getModifiers().contains(Modifier.PUBLIC)
+            || e.getModifiers().contains(Modifier.PROTECTED))
+        {
+            sb.append(depth(indent) + "TYPE " + e.getQualifiedName() + "\n");
+            indent += 2;
+            Void v = super.visitType(e, p);
+            indent -= 2;
+            return v;
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitVariable(VariableElement e, Void p) {
+        if (e.getModifiers().contains(Modifier.PUBLIC)
+            || e.getModifiers().contains(Modifier.PROTECTED)) {
+            sb.append(depth(indent)).append("VAR ")
+                    .append(makeVariableString(e)).append("\n");
+        }
+        // Safe to not recurse here, because the only thing
+        // to visit here is the constructor of a variable declaration.
+        // If it happens to contain an anonymous inner class (which it might)
+        // then this class is never visible outside of the package anyway, so
+        // we are allowed to ignore it here.
+        return null;
+    }
+
+    @Override
+    public Void visitExecutable(ExecutableElement e, Void p) {
+        if (e.getModifiers().contains(Modifier.PUBLIC)
+            || e.getModifiers().contains(Modifier.PROTECTED)) {
+            sb.append(depth(indent)).append("METHOD ")
+                    .append(makeMethodString(e)).append("\n");
+        }
+        return null;
+    }
+
+    /**
+     * Creates a String representation of a method element with everything
+     * necessary to track all public aspects of it in an API.
+     * @param e Element to create String for.
+     * @return String representation of element.
+     */
+    protected String makeMethodString(ExecutableElement e) {
+        StringBuilder result = new StringBuilder();
+        for (Modifier modifier : e.getModifiers()) {
+            result.append(modifier.toString());
+            result.append(" ");
+        }
+        result.append(e.getReturnType().toString());
+        result.append(" ");
+        result.append(e.toString());
+
+        List<? extends TypeMirror> thrownTypes = e.getThrownTypes();
+        if (!thrownTypes.isEmpty()) {
+            result.append(" throws ");
+            for (Iterator<? extends TypeMirror> iterator = thrownTypes
+                    .iterator(); iterator.hasNext();) {
+                TypeMirror typeMirror = iterator.next();
+                result.append(typeMirror.toString());
+                if (iterator.hasNext()) {
+                    result.append(", ");
+                }
+            }
+        }
+        return result.toString();
+    }
+
+    /**
+     * Creates a String representation of a variable element with everything
+     * necessary to track all public aspects of it in an API.
+     * @param e Element to create String for.
+     * @return String representation of element.
+     */
+    protected String makeVariableString(VariableElement e) {
+        StringBuilder result = new StringBuilder();
+        for (Modifier modifier : e.getModifiers()) {
+            result.append(modifier.toString());
+            result.append(" ");
+        }
+        result.append(e.asType().toString());
+        result.append(" ");
+        result.append(e.toString());
+        Object value = e.getConstantValue();
+        if (value != null) {
+            result.append(" = ");
+            if (e.asType().toString().equals("char")) {
+                int v = (int)value.toString().charAt(0);
+                result.append("'\\u"+Integer.toString(v,16)+"'");
+            } else {
+                result.append(value.toString());
+            }
+        }
+        return result.toString();
+    }
+}